Scraping web pages with python: Difference between revisions
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[[Category: Cookbook]] [[Category: xpath]] [[Category: python]] [[Category: lxml]] | |||
Revision as of 00:11, 23 March 2011
The html5lib parser is code that turns the source text of an HTML page into a structured object, allowing, for instance, to use CSS selectors or xpath expressions to select/extract portions of a page
You can use xpath expressions:
import html5lib, lxml
htmlsource="<html><body><p>Example page.</p><p>More stuff.</p></body></html>"
htmlparser = html5lib.HTMLParser(tree=html5lib.treebuilders.getTreeBuilder("lxml"), namespaceHTMLElements=False)
page = htmlparser.parse(htmlsource)
p = page.xpath("/html/body/p[2]")
if p:
p = p[0]
print "".join([t for t in p.itertext()])
outputs: More stuff.
Also CSS selectors are possible:
import html5lib, lxml, lxml.cssselect
htmlsource="<html><body><p>Example page.</p><p>More stuff.</p></body></html>"
htmlparser = html5lib.HTMLParser(tree=html5lib.treebuilders.getTreeBuilder("lxml"), namespaceHTMLElements=False)
page = htmlparser.parse(htmlsource)
selector = lxml.cssselect.CSSSelector("p")
for p in selector(page):
print "-"*20
print "".join([t for t in p.itertext()])
-------------------- Example page. -------------------- More stuff.